I play Mystery Heroes all the time. Challenging others to be the best across all characters is fun. To be great, it just needs to correct the staggering imbalance that often occurs.
- Give each team a minimum of 1 of each class (tank, damage, support) from the start and shuffle which players are which class a respawn.
- The character in each class as well as the other team players (beyond the core 3) will still be randomized
- This will help avoid impossible and FRUSTRATING scenarios like a team never getting a healer. But will maintain the awesome part of Mystery Heroes since the player is challenged to know how all characters operate.